A simplified transceiver structure for cyclic extended CDMA system with frequency domain equalization

In this paper, a new cyclic-extended block-spreading CDMA (CEBS-CDMA) system is proposed to combat multiple access interference (MAI) efficiently over a frequency selective fading channel for an asynchronous reverse link transmission. Attribute to the block spreading, the MAI is minimized due to the small channel variation across consecutive blocks in a typical high speed system, where the signaling block duration is very short. It suggests a simplified transceiver structure with symbol-wise efficient frequency domain equalization (FDE) to improve the performance and reduce the complexity under frequency selective fading channels. A new cell-specific scrambling code is proposed with the CEBS-CDMA system for a multi-cell environment reverse link transmission, suppressing other-cell interference (OCI) efficiently. The simulation results show that the proposed CEBS-CDMA system achieves much better performance of multiple users compared to the conventional direct sequence CDMA (DS-CDMA) and cyclic prefix-CDMA systems.